diff -uraN gs-orig/lib/gs_init.ps gs-psfiles/lib/gs_init.ps
--- gs-orig/lib/gs_init.ps	2007-04-24 13:02:42.000000000 +0100
+++ gs-psfiles/lib/gs_init.ps	2007-04-27 13:06:24.000000000 +0100
@@ -152,6 +152,7 @@
 currentdict /NOFONTPATH known   /NOFONTPATH exch def
 currentdict /NOGC known   /NOGC exch def
 currentdict /NOINTERPOLATE .knownget { /INTERPOLATE exch not def } if
+currentdict /NOMEDIAATTRS known /NOMEDIAATTRS exch def
 currentdict /NOOUTERSAVE known   /NOOUTERSAVE exch def
 currentdict /NOPAGEPROMPT known   /NOPAGEPROMPT exch def
 currentdict /NOPAUSE known   /NOPAUSE exch def
@@ -1469,7 +1470,22 @@
 % Set the default screen and BG/UCR.
 /.setdefaultbgucr {
   systemdict /setblackgeneration known {
-    { pop 0 } dup setblackgeneration setundercolorremoval
+% T. Kamppeter, Linux Foundation
+%
+% Martin Lottermoser, author of the "pcl3" driver writes in
+% contrib/pcl3/doc/gs-mods.txt, section C1:
+%
+% There is a bug in ghostscript's default configuration for the
+% undercolour removal and black generation functions. It shows up when
+% printing PostScript documents using the RGB colour space ("setrgbcolor" or
+% "sethsbcolor") on a device where the CMYK space is the native colour space;
+% this is the case for pcl3 if you specify "-sColourModel=CMYK". The bug
+% results in black being printed as a mixture of cyan, magenta, and yellow.
+%
+% The bug is simply fixed by replacing the line
+%   { pop 0 } dup setblackgeneration setundercolorremoval
+% with the following line:
+    {} dup setblackgeneration setundercolorremoval
   } if
 } bind def
 /.useloresscreen {	% - .useloresscreen <bool>
diff -uraN gs-orig/lib/gs_setpd.ps gs-psfiles/lib/gs_setpd.ps
--- gs-orig/lib/gs_setpd.ps	2007-04-24 13:02:42.000000000 +0100
+++ gs-psfiles/lib/gs_setpd.ps	2007-04-27 12:54:04.000000000 +0100
@@ -164,8 +164,17 @@
 % We don't include attributes such as .MediaSize, which all devices
 % are guaranteed to supply on their own.
 /.defaultpolicies mark
-  /PolicyNotFound 1
-  /PageSize 0
+  % M. Sweet, Easy Software Products
+  %
+  % Due to the fact that it is not possible to properly implement
+  % the selection policies from a Ghostscript driver, we have changed
+  % the default policy to "7" (impose) to avoid numerous problems with
+  % printing within CUPS...
+  %
+  % /PolicyNotFound 1
+  % /PageSize 0
+  /PolicyNotFound 7
+  /PageSize 7
   /PolicyReport {
     dup /.LockSafetyParams known {
 	% Only possible error is invalidaccess
@@ -376,21 +385,42 @@
     } bind
 .dicttomark readonly def
 
-% Define the keys used in input attribute matching.
-/.inputattrkeys [
-  /PageSize /MediaColor /MediaWeight /MediaType /InsertSheet /ManualFeed
-	% The following are documented in Adobe's supplement for v2017.
-  /LeadingEdge /MediaClass
-] readonly def
-% Define other keys used in media selection.
-/.inputselectionkeys [
-  /MediaPosition /Orientation
-] readonly def
-
-% Define the keys used in output attribute matching.
-/.outputattrkeys [
-  /OutputType
-] readonly def
+% M. Sweet, Easy Software Products:
+%
+% Define NOMEDIAATTRS to turn off the default (but unimplementable) media
+% selection policies for setpagedevice.  This is used by CUPS to support
+% the standard Adobe media attributes.
+NOMEDIAATTRS {
+  % Define only PageSize for input attribute matching.
+  /.inputattrkeys [
+    /PageSize
+  ] readonly def
+  % Define no other keys used in media selection.
+  /.inputselectionkeys [
+    /noInputSelectionsKeys
+  ] readonly def
+
+  % Define no keys used in output attribute matching.
+  /.outputattrkeys [
+    /noOutputAttrKeys
+  ] readonly def
+} {
+  % Define the keys used in input attribute matching.
+  /.inputattrkeys [
+    /PageSize /MediaColor /MediaWeight /MediaType /InsertSheet /ManualFeed
+	  % The following are documented in Adobe's supplement for v2017.
+    /LeadingEdge /MediaClass
+  ] readonly def
+  % Define other keys used in media selection.
+  /.inputselectionkeys [
+    /MediaPosition /Orientation
+  ] readonly def
+
+  % Define the keys used in output attribute matching.
+  /.outputattrkeys [
+    /OutputType /Duplex /Tumble /ManualFeed
+  ] readonly def
+} ifelse
 
 % Define all the parameters that should always be copied to the merged
 % dictionary.
@@ -502,11 +532,22 @@
 % They are expected to consume the top 2 operands.
 % NOTE: we currently treat all values other than 0, 1, or 7 (for PageSize)
 % the same as 0, i.e., we signal an error.
+%
+% M. Sweet, Easy Software Products:
+%
+% Define NOMEDIAATTRS to turn off the default (but unimplementable) media
+% selection policies for setpagedevice.  This is used by CUPS to support
+% the standard Adobe media attributes.
   0 {		% Set errorinfo and signal a configurationerror.
+      NOMEDIAATTRS {
+        % NOMEDIAATTRS means that the default policy is 7...
+        pop 2 index exch 7 put
+      } {
 	pop dup 4 index exch get 2 array astore
 	$error /errorinfo 3 -1 roll put
 	cleartomark
 	/setpagedevice .systemvar /configurationerror signalerror
+      } ifelse
   } bind
   1 {		% Roll back the failed request to its previous status.
 SETPDDEBUG { (Rolling back.) = pstack flush } if